java 获取网页指定内容-2（实践+修改）

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Arrays;

public class Weather {
String urlString;
String array;
StringBuffer sb=new StringBuffer("");

public static void main(String[] args) throws Exception {
Weather client = new Weather("http://www.weather.com.cn/weather/101181201.shtml");
client.run();
}
public Weather(String urlString) {
this.urlString = urlString;
}
public void run() throws Exception {

URL url = new URL(urlString);

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection
.getInputStream(),"utf8"));
String line;

while ((line = reader.readLine()) != null){
Pattern p = Pattern.compile("<p class=\"wea\">(.+?)</p>");
Matcher m = p.matcher(line);
while(m.find()) {
array = m.group(1);
sb.append(array+",");
}
}

String arr = sb.toString();
String[] s = arr.split("\\,");
System.out.println(s[s.length - 7]);

}

}

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Arrays;

public class Weather {
String urlString;
String array;
StringBuffer sb=new StringBuffer("");

public static void main(String[] args) throws Exception {

Weather client = new Weather("http://www.weather.com.cn/weather/101181201.shtml");
client.run();
}
public Weather(String urlString) {
this.urlString = urlString;
}
public void run() throws Exception {

URL url = new URL(urlString);

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection
.getInputStream(),"utf8"));
String line;

while ((line = reader.readLine()) != null){
Pattern p = Pattern.compile("<p class=\"wea\">(.+?)</p>");
Matcher m = p.matcher(line);
while(m.find()) {
array = m.group(1);
sb.append(array+",");//符合正则的数据追加到sb,并以逗号分割
}
}

String arr = sb.toString();//sb转为字符串
String[] s = arr.split("\\,");//字符串转为数组，以逗号为标记
System.out.println(s[s.length - 7]);//取数组中倒数第7个数

}

}